/*
 * CCVisu is a tool for visual graph clustering
 * and general force-directed graph layout.
 * This file is part of CCVisu.
 *
 * Copyright (C) 2005-2011  Dirk Beyer
 *
 * CCVisu is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * CCVisu is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with CCVisu; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Please find the GNU Lesser General Public License in file
 * license_lgpl.txt or http://www.gnu.org/licenses/lgpl.txt
 *
 * Dirk Beyer    (firstname.lastname@uni-passau.de)
 * University of Passau, Bavaria, Germany
 */
package org.sosy_lab.ccvisu.readers;

import java.util.ArrayList;
import java.util.List;

import org.sosy_lab.ccvisu.graph.Relation;
import org.sosy_lab.ccvisu.graph.Tuple;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class SAXHandlerODSTable extends DefaultHandler {

  private int            xmlLevel          = 0;
  private String         tableName         = "";
  private String         contentOfCurrCell = "";
  private List<String>   cellsOfCurrRow    = new ArrayList<String>();
  private final Relation relations;

  public SAXHandlerODSTable(Relation relations) {
    super();
    assert(relations != null);

    this.relations = relations;
  }

  @Override
  public void startElement(String uri, String localName, String qualifiedName,
      Attributes attributes) throws SAXException {

    assert (qualifiedName != null);
    xmlLevel++;

    if (qualifiedName.toLowerCase().equals("table:table")) {
      assert (xmlLevel == 4);
      assert (attributes != null);
      tableName = attributes.getValue("table:name");
      assert (tableName != null);

    } else if (qualifiedName.toLowerCase().equals("table:table-row")) {
      assert (xmlLevel == 5);

    } else if (qualifiedName.toLowerCase().equals("table:table-cell")) {
      assert (xmlLevel == 6);
      assert (!tableName.equals(""));

    } else if (qualifiedName.toLowerCase().equals("text:p")) {
      assert (!tableName.equals(""));

    } else {
      // Not handled.
    }
  }

  @Override
  public void endElement(String uri, String localName, String qualifiedName)
      throws SAXException {

    assert(qualifiedName != null);

    if (qualifiedName.toLowerCase().equals("table:table-cell")) { // CELL
      assert (xmlLevel == 6);
      cellsOfCurrRow.add(contentOfCurrCell);
      contentOfCurrCell = "";

    } else if (qualifiedName.toLowerCase().equals("table:table-row")) { // ROW
      assert (xmlLevel == 5);
      List<String> tuples = new ArrayList<String>();
      for (String cell : cellsOfCurrRow) {
        tuples.add(cell);
      }
      relations.addTuple(new Tuple(tableName, tuples));
      cellsOfCurrRow.clear();
    }

    xmlLevel--;
  }

  @Override
  public void characters(char[] chars, int start, int length) throws SAXException {
    // Concatenate if cell is broken into parts by the parser.
    contentOfCurrCell += new String(chars, start, length);
  }
}
